Keldon Overseer

The kicker on this design splits one card into two cleanly separated games. Unkicked, it is a hasty 3/1 beater, the kind of body that demands a block or trades into one. Kicked, it becomes a tempo swing with a Threaten effect stapled on: the haste you paid for at the base cost gets echoed onto the creature you steal, since the borrowed creature untaps and gains haste, so it can attack the turn you take it. That layering is the clever part. Most temporary-theft spells give you a body for a turn and nothing else; this gives you the stolen creature plus a hasty 3/1 that stays, which means the borrowed permanent is free to die in combat or feed a sacrifice outlet without costing you anything you brought. The cost curve is deliberately top-heavy: at it is fine early filler, and the full kicker pushes the total commitment to seven mana, late enough that the steal lands on a target worth taking. Red's rent-a-creature effects, from Threaten through Act of Treason, have always been single-purpose sorceries that rot in hand when the board is empty. This one never does: the floor is always a three-mana creature you can cast and swing with on curve, with the theft mode waiting for a game that stalls long enough to earn it.